<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .outer {
            width: 1300px;
            height: 900px;
            border: 1px solid black;
        }

        .outer:hover .box {
            width: 1300px;
        }

        .box {
            width: 200px;
            height: 100px;
            transition-property: all;
            transition-duration: 2s;
            /* transition-delay: 2s; */
        }

        .box1 {
            background-color: aquamarine;
            /* transition-timing-function: ease; */
            transition-timing-function: linear;
            /* transition-timing-function: ease-in; */
            /* transition-timing-function: ease-out; */
            /* transition-timing-function: ease-in-out; */
            /* transition-timing-function: step-start; */
            /* transition-timing-function: step-end; */
            /* transition-timing-function: steps(20,end); */
            /* transition-timing-function: steps(20, start); */
            /* transition-timing-function: cubic-bezier(.7, 1.01, .91, 1.48); */
        }
    </style>
</head>

<body>
    <div class="outer">
        <div class="box box1"></div>
    </div>
</body>

</html>